Abstract
Summary Differential capacity measurements have been made using a polished polycrystalline zinc electrode in aqueous solutions of NaClO 4 and NH 4 ClO 4 at various pH's. In solutions of NaClO 4 at pH values >3.4 strong OH − ion interaction with the electrode is confirmed. In NH 4 ClO 4 solutions this interaction is not appreciable until the pH is raised to about 8.6. This is thought to be due to the weakly acidic nature of the ammonium ion, which produces an increase in the local acidity at the zinc surface. To a first approximation the differential capacitance of the zinc electrode in neutral solutions of ammonium salts can be identified with the double layer capacity, since the characteristics of the electrode in the additional presence of tetrabutylammonium cations are very similar to those observed for zinc single crystals. This paper therefore re-emphasises the importance of solution pH in the determination of the double layer capacity of polished polycrystalline zinc.
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